I did watch the show and just wish time could be would back so that he never became involved with that woman...and stayed with Mary his friend, instead...I am certain that the break-up with the Marilyn person is directly related to his death, i.e. by her now-late son, just as the few who have come forward with something to say have indicated, but unsure if they will get what they need to actually charge anyone. $60K is a good reward and may be why they have these tips.
I guess I understand why the police did not tell the family about these tips since they could not proven at all and the two groups were already so antagonized toward one another...it would have made things worse. It must be impossible for families to deal with people they believe have knowledge or guilt but cannot prove anything...i am sorry for Billy's family and friends...